The fellows at Auto Express are reporting that BMW and Fiat will join their forces in making their Isetta and Topolino models, some of the most economical cars when it comes to fuel consumption. The goal: somewhere around the 100MPG mark.

BMW’s efforts in creating an extremely eco-friendly and economical car, derive from the need to comply with the European Commission’s plans to impose an average 120g/km limit on the model ranges of all firms selling cars across the Continent by 2012. Also, by 2010, BMW needs to align with the upcoming California’s law that forces the car automaker to develop a zero-emissions vehicle.

And judging from the renderings, I truly believe that a BMW Isetta will be a success for BMW, especially in the current market where gas prices are at all time high and the future doesn’t look too rosy. The car will be a great sell even in large cities as Chicago, where every day I keep seeing more and more SMART cars.

Also, yesterday, I was doubting BMW’s direction with their Progressive Activity Vehicle and mentioned that I do not see a reasonable argument behind building that car, but I absolutely stay behind the Isetta and BMW’s future plans to build a gas-friendly car.